ライフサイエンスコーパス: spectrophotometry

1 t had no influence on colour loss over time (spectrophotometry).

2 infrared spectroscopy (FTIR) and UV-visible spectrophotometry.

3 s were determined by flame atomic absorption spectrophotometry.

4 C) and simultaneously analysed using UV-VIS spectrophotometry.

5 kinetically characterized using stopped-flow spectrophotometry.

6 al activity by sulfide measurements using UV-spectrophotometry.

7 ferential pulse voltammetry and fluorescence spectrophotometry.

8 rent collagenic substrates was determined by spectrophotometry.

9 egrees C was investigated using stopped-flow spectrophotometry.

10 idative stress markers by flow cytometry and spectrophotometry.

11 data were pooled from studies that used G6PD spectrophotometry.

12 ing cyclic voltammetry and UV-vis absorption spectrophotometry.

13 ative methodologies, such as HPLC and UV/VIS spectrophotometry.

14 an iron-polyphenol complex was followed with spectrophotometry.

15 trate at pH 6.6 was assessed by fluorescence spectrophotometry.

16 e tested by ultraviolet-visible (UV-visible) spectrophotometry.

17 good agreement with those obtained by UV-VIS spectrophotometry.

18 dies of Raman spectroscopy, FTIR, and UV-Vis spectrophotometry.

19 cterized by mass spectrometry and absorbance spectrophotometry.

20 tions were determined by densitometry and/or spectrophotometry.

21 rmined using inductively coupled plasma-mass spectrophotometry.

22 in situ detection of the analyte via UV-vis spectrophotometry.

23 n of laser Doppler flowmetry and reflectance spectrophotometry.

24 riacetyl cellulose membrane using absorption spectrophotometry.

25 ) was studied by rapid-scanning stopped-flow spectrophotometry.

26 sted laser desorption ionization tandem mass spectrophotometry.

27 quantified by papain digest and fluorescence spectrophotometry.

28 oxynaphthalene were measured by stopped-flow spectrophotometry.

29 ry complexes I, II, and IV was determined by spectrophotometry.

30 and antioxidant capacity were determined by spectrophotometry.

31 on levels were measured by atomic absorption spectrophotometry.

32 th the use of papain digest and fluorescence spectrophotometry.

33 ation with zone fluidic multichannel kinetic spectrophotometry.

34 he relative reactivities were measured by UV spectrophotometry.

35 um total cholesterol levels were measured by spectrophotometry.

36 opped-flow, high-pressure, and pressure jump spectrophotometry.

37 rubicin content was assayed with fluorescent spectrophotometry.

38 ytochemistry, electroretinography (ERG), and spectrophotometry.

39 in an in situ gel assay and by stopped flow spectrophotometry.

40 el hydrophobic drug, were measured by UV-Vis spectrophotometry.

41 investigated by rapid scanning stopped-flow spectrophotometry.

42 ontent by graphite furnace atomic absorption spectrophotometry.

43 asma protein thiol oxidation was measured by spectrophotometry.

44 Zinc binding was followed by rapid-scanning spectrophotometry.

45 e cofactor, as judged by ultraviolet/visible spectrophotometry.

46 strength was investigated using stopped-flow spectrophotometry.

47 in were measured using absorption-difference spectrophotometry.

48 d in the hydration direction by stopped-flow spectrophotometry.

49 ly at 4 degrees C and pH 7.5 by stopped-flow spectrophotometry.

50 force microscopy, and UV-visible absorption spectrophotometry.

51 and Boulton's method, respectively, using UV-spectrophotometry.

52 easured by pulse radiolysis and stopped-flow spectrophotometry.

53 um content was measured by atomic absorption spectrophotometry.

54 dichroism, mass spectrometry, and absorption spectrophotometry.

55 4 to 150 kDa was determined by fluorescence spectrophotometry.

56 ose obtained by video-based microscopy or by spectrophotometry.

57 nes were measured by gas chromatography/mass spectrophotometry.

58 ar Mg(2+) were measured by atomic absorbance spectrophotometry.

59 ET microfluorometry, and single-cell imaging spectrophotometry.

60 rized by UV-visible and resonance Raman (RR) spectrophotometry.

61 eterminations were made by atomic absorption spectrophotometry.

62 tography and analyzed by electrophoresis and spectrophotometry.

63 Iron levels were measured using absorption spectrophotometry.

64 measured by electrothermal atomic absorption spectrophotometry.

65 hone's ambient light sensor (ALS) to perform spectrophotometry.

66 sured the affinity of this interaction using spectrophotometry.

67 ) can be continuously monitored using UV-VIS spectrophotometry.

68 cofactor was investigated by single-crystal spectrophotometry.

69 rent DMPC/DMPG ratios was then determined by spectrophotometry.

70 and CSF were determined by atomic absorption spectrophotometry.

71 ted form, and studied using cryogenic UV-vis spectrophotometry.

72 tion of isothermal titration calorimetry and spectrophotometry.

73 tal-mimosine complexes were assessed through spectrophotometry.

74 ettuce) prior to its determination by UV-Vis spectrophotometry.

75 ng of rt-PA in OFP t-ELIP was assessed using spectrophotometry.

76 4-nitrophenol from the polymer using UV-vis spectrophotometry.

77 and antioxidant activity were determined by spectrophotometry.

78 chelating peptide is not sensitive enough by spectrophotometry.

79 rifugation, and quantification by absorption spectrophotometry.

80 ls capture; and they are monitored by UV-vis spectrophotometry.

81 asoline vehicle emissions was examined using spectrophotometry.

82 them metal chelation, studied by UV-visible spectrophotometry.

83 helation capacity determined from UV-visible spectrophotometry.

84 copy, and absorption as well as fluorescence spectrophotometry.

85 A sequence was then detected by fluorescence spectrophotometry.

86 260 for the quantification of dsRNA using UV spectrophotometry.

87 multaneously using near-infrared imaging and spectrophotometry.

88 liquid chromatography/mass spectrometry and spectrophotometry.

89 ns, chlorophyll and carotenoids detection by spectrophotometry.

90 measured with scanning probe microscopy and spectrophotometry.

91 GR salivary levels were analyzed by spectrophotometry.

92 aphy and measurement of oxygen saturation by spectrophotometry.

93 formational changes by fluorescence emission spectrophotometry.

94 linear regression (MLR) were built using UV spectrophotometry (190-400 nm) and chemical analysis (en

95 Fe(3+) chelates in pH 6-7 were evaluated by spectrophotometry (380-700nm) and colorimetry (CIE-L( *)

96 monoacylated and diacylated Cy fractions by spectrophotometry (380-700nm) and colorimetry in pH 5-8.

97 The spectrophotometry (84-1720 mug/g solids) method generall

98 Fe and Zn), quantified by atomic absorption spectrophotometry (AAS), and formula viscosity, after in

99 mental measurements from stopped-flow UV/vis spectrophotometry afforded derivation of equilibrium con

100 the analysis is performed using fluorescence spectrophotometry after monochlorobimane (a recognized p

101 Transient spectrophotometry also revealed the sequential formation

102 Agarose gel electrophoresis and ultraviolet spectrophotometry analysis indicate that complexes of cr

103 t behaviors of CMIP were characterised using spectrophotometry analysis.

104 Absorption, emission spectrophotometries and proton and phosphorus NMR spectr

105 es have been investigated using stopped-flow spectrophotometry and (1)H NMR measurements at 25.0 degr

106 The complex was characterized by UV-spectrophotometry and (1)HNMR.

107 ere measured at steady state by stopped-flow spectrophotometry and at chemical equilibrium by the exc

108 ns was measured in selected subjects by both spectrophotometry and autofluorescence imaging.

109 d, dissolved in water, and iodine assayed by spectrophotometry and by ICP-MS.

110 signed, and its binding was characterized by spectrophotometry and crystallography.

111 6PDH), and, glutathione reductase (GR) by UV spectrophotometry and determined glutathione peroxidase

112 ve been investigated by stopped-flow visible spectrophotometry and deuterium kinetic isotope effects.

113 d in gene therapy was studied by ultraviolet spectrophotometry and differential scanning calorimetry.

114 responding studies were conducted by visible spectrophotometry and digital image acquisition.

115 -butoxyl radical and characterized by UV-vis spectrophotometry and EPR spectroscopy.

116 h kinetic studies that utilized stopped-flow spectrophotometry and flash photolysis.

117 gh performance liquid chromatography (HPLC), spectrophotometry and flow cytometry have been used to e

118 s (MRPs) was monitored by mass spectrometry, spectrophotometry and fluorimetry.

119 both for quantitation of sulfonamides using spectrophotometry and for naked-eye semi-quantitative es

120 HADH activity was measured by spectrophotometry and found to be significantly higher f

121 ured with SXRF and standard bulk techniques (spectrophotometry and graphite furnace atomic absorption

122 an sweetpotato cultivars were studied, using spectrophotometry and high performance liquid chromatogr

123 37 degrees C and its oxidation monitored by spectrophotometry and high-performance liquid chromatogr

124 bance interfering compounds was performed by spectrophotometry and HPLC analysis.

125 ophotometry and polyphenols were analysed by spectrophotometry and HPLC-DAD.

126 d carotenoid composition were analysed using spectrophotometry and HPLC.

127 UV/Vis spectrophotometry and HPLC/DAD-ESI/MS were applied to de

128 In this work, UV/Vis spectrophotometry and HPLC/DAD-ESI/MS were applied to de

129 rmined by graphite furnace-atomic absorption spectrophotometry and inductively coupled plasma-mass sp

130 raction of AAC with DNA are determined using spectrophotometry and isothermal titration calorimetry (

131 active agent content was measured by UV-Vis spectrophotometry and its composition confirmed by HPLC-

132 ons of reducing molecules were determined by spectrophotometry and liquid chromatography-mass spectro

133 Overall, the titrations of 1 using UV spectrophotometry and NMR titrations by anions reveal th

134 rease of the total level of RNA using UV/VIS spectrophotometry and on the mRNA levels/cell for a larg

135 Colour was evaluated by spectrophotometry and polyphenols were analysed by spect

136 red their catalytic activity by stopped-flow spectrophotometry and pulse radiolysis.

137 -)(1) s(-)(1), as determined by stopped-flow spectrophotometry and pulse radiolysis.

138 Bile salts were undetectable, using spectrophotometry and rarely detectable using dual mass

139 studied at pH 6-8 and 37 degrees C by UV-Vis spectrophotometry and reaction products were characteriz

140 II)SOD was measured by scanning stopped-flow spectrophotometry and revealed the presence of an interm

141 amination, can be detected and quantified by spectrophotometry and scanning densitometry, and resolve

142 ruction of simple detection systems based on spectrophotometry and spectrofluorometry principles, cus

143 conjugated diene concentrations measured by spectrophotometry and the heat flux dissipated by oxidat

144 conjugated diene concentrations measured by spectrophotometry and the heat flux dissipated by oxidat

145 s, tannins, carotenoids and chlorophylls) by spectrophotometry and the individual compounds by liquid

146 ed to quantify assay-based variation in G6PD spectrophotometry and to explore the diagnostic implicat

147 wning was monitored by UV-visible absorption spectrophotometry and UHPLC-DAD.

148 Spectrophotometry and UPLC-DAD-ESI-MS/MS systems were ut

149 mbrane is simultaneously measured via UV-vis spectrophotometry and voltammetry/chronoamperometry as a

150 HPLC-DAD-MS), copigmentation/polymerisation (spectrophotometry), and colour (Tristimulus and Differen

151 ns was determined by using x-ray scattering, spectrophotometry, and confocal microscopy.

152 d by electrode oximetry, pH-stat, UV-visible spectrophotometry, and electron paramagnetic resonance s

153 coupled plasma mass spectrometry, UV-visible spectrophotometry, and EPR spectroscopy revealed charact

154 NAG was measured by spectrophotometry, and KIM-1 was measured by a microsphe

155 of reduced BFDMA, as characterized by UV/vis spectrophotometry, and lead to activated lipoplexes that

156 ophilic/lipophilic antioxidant potentials by spectrophotometry, and major carotenoids by HPLC-DAD.

157 Peptide mapping, thiol titrations, UV-vis spectrophotometry, and mass spectrometry show that inact

158 , polyacrylamide gel electrophoresis, UV-Vis spectrophotometry, and NMR spectroscopy indicated that t

159 Results from immunohistochemistry, spectrophotometry, and single-cell RT-PCR demonstrate th

160 hniques and further characterized by NMR, UV spectrophotometry, and tandem mass spectrometry.

161 ons contents determined by atomic absorption spectrophotometry, and the MIR spectra, with various tec

162 al intermediate was detected by stopped-flow spectrophotometry, and the rate constants of formation a

163 h group for industrial application, HPLC and spectrophotometry, and to compare the suitability of the

164 samples were employed: absorption and UV-vis spectrophotometry, antioxidant capacity (DPPH, FRAP, ABT

165 nts of ferrylMb are observed by stopped-flow spectrophotometry, appearing at a rate consistent with t

166 value for cvSOD was determined by stop-flow spectrophotometry as 1.28 x 10(8) M(-1) s(-1), suggestin

167 ples collected prospectively and considering spectrophotometry as gold standard (using kits from Trin

168 ce confocal microscopy and UV/Vis-absorption spectrophotometry assess transient solute concentration

169 low sample consumption, and straightforward spectrophotometry based detection.

170 ) and quantified by fiber optic linear array spectrophotometry based on the formation of its azo dye

171 bel on the surface is quantified with UV/vis spectrophotometry based on the molar absorption coeffici

172 Spectrophotometry-based and radioligand-based binding as

173 Spectrophotometry-based in vitro assays show that ThrH i

174 Here, we compared these spectrophotometry-based procedures for pyruvate analysis

175 fenic acid have been studied by stopped-flow spectrophotometry between pH 10 and 14.

176 s solution have been studied by stopped-flow spectrophotometry between pH 6 and 14.

177 ubstantial variation in G6PD measurements by spectrophotometry between sites.

178 rolyze cocaine as monitored by HPLC and also spectrophotometry by coupling cleavage of the benzoylthi

179 bria are monitored by methods such as UV-vis spectrophotometry, calorimetry, or nuclear magnetic reso

180 orelease rates of photoCORP-1 (determined by spectrophotometry) can be modulated by both the concentr

181 lor parameters, ultraviolet-visible (UV/Vis) spectrophotometry, carotenoid profile, encapsulation eff

182 Melanin index as measured with reflectance spectrophotometry compared with dermatologist- and parti

183 Spectrophotometry confirmed that heme bound to the integ

184 ct steps are observed by stopped-flow UV/Vis spectrophotometry, corresponding to ketonisation and C-C

185 se enzymes in yeast was monitored by in situ spectrophotometry coupled to in vivo screening of oxygen

186 on electron microscope (TEM) imaging, UV-vis spectrophotometry, cyclic voltammetry (CV), field emissi

187 ond formation was investigated by UV-visible spectrophotometry, cyclic voltammetry, mass spectrometry

188 procedure was performed in column method by spectrophotometry detection technique.

189 action with GSH, determined via stopped flow spectrophotometry, displayed second-order rate constants

190 , front face fluorescence, and UV absorption spectrophotometries, dynamic light scattering, and DSC,

191 es (DTAs) utilizing NMR spectroscopy, UV-vis spectrophotometry, electrochemistry, and DFT computation

192 iRNA released from LNPs was determined using spectrophotometry employing the fluorescent indicator SY

193 cked microcolumn and flame atomic absorption spectrophotometry (FAAS) detection.

194 terized by NMR line broadening, stopped-flow spectrophotometry, fluorescence quenching, and ultracent

195 Polarography, spectrophotometry, fluorimetry, high-performance liquid

196 existing methods of uranyl detection such as spectrophotometry, fluorometry, and a SERS method based

197 This work demonstrates the use of in situ spectrophotometry for pH measurement under GCS-relevant

198 We demonstrate the first use of smartphone spectrophotometry for readout of fluorescence-based biol

199 the quantification of beta-carotene, and UV spectrophotometry for the quantification of carotenoids

200 on microscopy, dynamic light scattering, and spectrophotometry) for experimental evaluation of damage

201 d cells and through atomic force microscopy, spectrophotometry, Fourier transform infrared and mass s

202 fiber and gas chromatography coupled to mass spectrophotometry (GC-MS) was used to study the volatile

203 ctrophoresis, molecular dynamics, and UV-vis spectrophotometry give clues to the details of the inter

204 total anthocyanin content by pH-differential spectrophotometry, glycoalkaloid, alpha-chaconine and al

205 Absorption spectrophotometry has been and still is the industry sta

206 Fiber-optics-based cuvetteless micro-spectrophotometry has been used for colorimetric determi

207 aphy, coupled to UV-visible and fluorescence spectrophotometry, has been developed for determination

208 alyses, including LCMS, UV-Vis spectroscopy/ spectrophotometry, high resolution mass spectrometry and

209 resulting from pregnancy and parturition by spectrophotometry, histology, and (13)C, (2)H nuclear ma

210 method for G6PD activity is ultraviolet (UV) spectrophotometry; however, a universal G6PD activity th

211 ent analytical techniques including FTIR, UV spectrophotometry, HPLC and LC-MS analysis.

212 MSP3 to bind several molecules of heme by UV spectrophotometry, HPLC, and electrophoresis.

213 Rapid scanning stopped-flow absorption spectrophotometry in conjunction with multiple turnover

214 ination of sulphadiazine and trimethoprim by spectrophotometry in some bovine milk and veterinary med

215 lso characterized by UV/vis and fluorescence spectrophotometry in the presence or absence of a number

216 Kinetic studies using stopped-flow spectrophotometry indicate that BSOR reduction by NADPH

217 complex structures were determined by UV-vis spectrophotometry, infrared spectroscopy, thermogravimet

218 nosis of G6PDd compared to the gold standard spectrophotometry (International Prospective Register of

219 Spectrophotometry is a fundamental technique in many are

220 As such, it was concluded that spectrophotometry is not an accurate measure of the degr

221 UV absorbance spectrophotometry is widely used for the quantification

222 combination of calorimetry and stopped-flow spectrophotometry kinetics experiments showed that this

223 er desorption/ionization time of flight mass spectrophotometry (MALDI-TOF-MS) and liquid chromatograp

224 ta obtained using thin-layer chromatography, spectrophotometry, mass spectrometry (MS), and MS-MS ind

225 5'-phosphate (FAPy), as shown by UV-visible spectrophotometry, mass spectrometry, and NMR.

226 trophenol formation followed by stopped-flow spectrophotometry matched perfectly the rate constant of

227 diacetate), NADPH, NADP(+) and ATP contents (spectrophotometry), matrix metalloproteinase-2 (MMP2) ac

228 Spectrophotometry measurements assessing FST were statis

229 The spectrophotometry measurements for dermatologist-determi

230 The spectrophotometry measurements for participant-determine

231 some real samples by flame atomic absorption spectrophotometry measurements.

232 uartz tube atom trap flame atomic absorption spectrophotometry method (Mo coated-T-SQT-AT-FAAS) was d

233 The results were compared with those of a spectrophotometry method and showed relative error rangi

234 In this work, a sensitive, simple and viable spectrophotometry method to determine iron in wheat and

235 rmance liquid chromatography (HPLC) and mass spectrophotometry (MS).

236 Reflectance spectrophotometry objectively measures the melanin index

237 UV-visible spectrophotometry of organic-phase solutions and thin pl

238 visible and ultraviolet (UV) angle-resolved spectrophotometry of the intact tissue, and mass spectro

239 Multi-wavelength stopped-flow spectrophotometry of the oxidative deposition of iron in

240 ctroscopy, iron-binding by atomic absorption spectrophotometry, oligomerization in manganese-substitu

241 tration, and on dilution factors measured by spectrophotometry on a blank digestion.

242 y can be used in a cuvette using traditional spectrophotometry or as a 96-well plate-based format usi

243 rable concentration estimates using NanoDrop spectrophotometry or established from droplet-digital po

244 escence spectral analysis, atomic absorption spectrophotometry, Perls' iron stain, and immunofluoresc

245 Here, optical stopped-flow spectrophotometry, rapid freeze-quench EPR spectroscopy

246 On the other hand, biosensors and spectrophotometry reflected a decrease in total sugar co

247 y high performance liquid chromatography and spectrophotometry, respectively.

248 ted were sex of the participant, CSG result, spectrophotometry result in U/gHb, and haemoglobin (Hb)

249 0min at 293K and pH7.5 as measured by UV-Vis spectrophotometry, returning to the ground state through

250 Rapid-mixing, pH-jump spectrophotometry revealed a basic pKa of 10.0 for the F

251 Low-temperature photodissociation spectrophotometry revealed that neither oxidase has liga

252 Examination of pigmentary changes by spectrophotometry revealed that the children in the cont

253 EPR spectroscopy and stopped-flow rapid-scan spectrophotometry revealed that the hydrazine cation rad

254 UV-Vis spectrophotometry reveals that DNA films with surface de

255 sulfite a product, which can be detected by spectrophotometry (S) and fluorometry (F).

256 It is concluded that the stopped-flow spectrophotometry should be considered the method of cho

257 Lastly, stopped-flow fluorescence spectrophotometry showed that the rate of these fluoresc

258 lity control was performed using ultraviolet spectrophotometry, size-exclusion high-performance liqui

259 vine serum albumin (BSA) was investigated by spectrophotometry, spectrofluorometry, FT-IR and circula

260 slotted quartz tube flame atomic absorption spectrophotometry (SQT-FAAS) after preconcentration by t

261 slotted quartz tube-flame atomic absorption spectrophotometry (SQT-FAAS).

262 ve many applications, especially in indirect spectrophotometry, such as in the protein assay shown he

263 tion of heparosan with heparin lyase III and spectrophotometry that is safer and more specific than t

264 We confirmed, using western blot and spectrophotometry, that Hsp90 or BRAF inhibitor-induced

265 Using stopped-flow spectrophotometry, the reaction with m-chloroperoxybenzo

266 Based on results from stopped-flow spectrophotometry, the reduced enzyme-3HB complex reacts

267 ompared to the values measured by UV-visible spectrophotometry, the standard method for measuring Hb

268 nce spectroscopy, circular dichroism, and uv spectrophotometry: The corresponding rate constants were

269 In comparison with spectrophotometry, there are no significant differences

270 of the results with those obtained by UV-vis spectrophotometry, this demonstrates the high accuracy o

271 on produced by NADPH oxidase was measured by spectrophotometry through WST-1 reduction at 450nm and u

272 th of the nanogels with NR was determined by spectrophotometry to be 28% (nHP-SW) and 31% (nHP-OP).

273 ole are shown by UV-visible and fluorescence spectrophotometry to be strong ligands for tRNA, giving

274 ehydration conditions and analysed by UV-Vis spectrophotometry to determine crocins, picrocrocin and

275 denaturation studies in conjunction with UV spectrophotometry to determine hypochromicity requires p

276 was studied using stopped-flow fluorescence spectrophotometry to investigate the underlying mechanis

277 d is based on the use of near-infrared (NIR) spectrophotometry to measure spectra of lung tissue from

278 he stoichiometry elucidation, and UV-visible spectrophotometry to obtain the association equilibrium

279 We used spectrophotometry to quantify the coloration of the spec

280 a combination of flameless atomic absorption spectrophotometry to quantify vacuolar and whole cell ir

281 ced flavins has been studied by stopped flow spectrophotometry under anaerobic conditions, and second

282 R-) were calculated comparing CSG results to spectrophotometry using a random-effects bivariate model

283 )-4H-chromen-4-one 1 have been determined by spectrophotometry using aqueous methanol solutions.

284 d-infrared spectroscopy (MIR) and UV-visible spectrophotometry (UV-vis), have been combined to classi

285 s and volatile compounds were analysed using spectrophotometry-UV and GC-MS-SPME, respectively.

286 cs were measured by simultaneous reflectance spectrophotometry (venous oxygen saturation StO2 and rel

287 UV-visible spectrophotometry verified the separation of the tiopron

288 Stopped-flow spectrophotometry was examined as a tool to assign midpo

289 organic droplets (AA-LDS-LLME-SFOD) prior to spectrophotometry was successfully applied for quantitat

290 Spectrophotometry was used as a chaperone assay.

291 Spectrophotometry was used to measure UV transmission in

292 hours following RF ablation, and fluorescent spectrophotometry was used to quantify extracted doxorub

293 Experiments in which visible spectrophotometry was utilized reveal that rHb(alphaL29F

294 Using spectrophotometry, we analyzed the rates of Ca(2+) pumpi

295 By using stopped-flow spectrophotometry, we demonstrated that electron transfe

296 Using stopped-flow spectrophotometry, we demonstrated that electron transfe

297 In this work, using stopped-flow spectrophotometry, we investigated the mechanism of hydr

298 dy, UV/visible and fluorescence stopped-flow spectrophotometries were used to determine the kinetics

299 Also, EPR spin trapping and UV-vis spectrophotometry were used to analyze the effect of ary

300 ere monitored at 4 degrees c by stopped flow spectrophotometry with several hydroperoxides as substra